Inductor-generator for ignition purposes.



Patented J an. 21, 1913.

l A TTORNEY I INVEN 0R M J J. L. MILTON. INDUGTOR GENERATORIOR IGNITION PURPOSES.

APPLICATION `FILED JUNE 17,1907

WITNESSES:

c `uNiTEio STATES PATENT OFFICE..

JOI-IN L. MILTON, OF CHICAGO, ILLINOIS.

INDUCTOR-GENERATOR FOR IGNITION PURPOSES.

Application filed .Tune 17, 1907.

To all whom t may concern Be it known' that I, JOHN L. MILTON, a citizen of the United States, residing at Chicago, in the count-y of Cook and State of Illinois, have invented certain new and useful Improve-ments in Inductor-Generators for Ignition Purposes, of which the following is a specification, reference being had therein to the accompanying drawings. This invention relates to improvements in inductor generators for ignition purposes. It is an improvement upon the apparatus for similar purposes set forth and described in my application Serial No. 357,041,1iled February 12, 1907, for inductor generators.

Figure 1 is a front face view of an inductor generator embodying my improvements. Fig. 2 is a `section on the line 2 2, Fig. 1. Fig. 3 is a diagrammatic View showing the inductor in another position than that shown in Fig. 1. Fig. 4: is a diagrammatic View showing the inductor in still another position. Fig. 5' is a diagrammatic view Aillustrating a modified type of inductor. In the drawings 1, 2, indicate permanent field magnets, preferably arranged parallel to each other. These permanent field magnets may be of any suitable construction. I prefer, for the purpose of economy of cost and simplicity of construction, to make up each field magnet of a plurality or group of permanent straight bar magnets 3.

4t, 5, represent pole pieces one interposed between the positive poles of said permanent magnets, and the other interposed loetween the negative poles of the permanent magnets. Preferably these pole pieces are made up of laminas of metal of high magnetic permeability and susceptibility, and form withthe permanent magnets a' substant-ially rectangular frame. For'this purpose I have provided the same .simple arrangementand correlation of the ends of the permanent'magnets and the ends of the pole pieces,A shown and described in my applivcationfor Letters Patent hereinbefore rei I. ferred to, namely, the str aight bar magnets l ,forming Aeach group of magnets increase in length `from the innermost one outward, and are -so arranged` as to form a series of steps 6 V'at either end of each permanent field magnet. The end of .each pol-e piece is stepped to correspond with the end of the permanent vmagnet adjacent to it.

7 are U-shaped clips, each ittedover the Specification of Letters Patent.

' Patented Jan. 21,1913.

Serial No. 379,485.

end of a permanent 'field magnet and the end of a pole piece adjacent. thereto, and secured to the pole piece in any suitable manner, as for example by a rivet 7.

Each pole piece carries three inwardly turned polar projections, those on the pole piece l being indicated by 8, 9, and 10, respectively, and those on the polepiece 5 by 8, 9, and 10', respectively. Preferably, the laminae of which each pole piece is built up are suitably stamped out to form the polar projections carried by the pole pieces.

11 is an inductor shaft. 12 is an inductor suitablysecured to said shaft and arranged to rotate between the polar projections on the opposite pole pieces. This inductor is preferably made up of laminac of metal of high magnetic permeability and shaped to form four radial extensions or projections 12 arranged 90 degreesapartabout the axis of the shaft 12, in the form of a Maltese cross.

The polar faces of the polar projections carried by the pole pieces are each curved tothe are of a circle common to all, struck fromthe axis of the shaft 11'r as a center, l and the coperating surfaces of the projections 12 on the inductor are correspondingly curved and arranged to operate as closely adjacent to the polar faces of the polar projections as mechanical conditions will permit.

The inductor shaft 11 may be supportedv in any suitable manner. For the purpose of illustration I have shown it mounted in a bearing 13 carried by a suitable bearing standard 14.

14 is a lubricant chamber in the standard 14, and 14a is an oil ring surrounding the inductor shaft in said lubricant chamber. y

15 is a supporting plate of non-magnetic material forthe field magnet frame. It has four radially extending arms 15 arranged 90 degrees apart, and each one suitably sethe-bearing standard lland angularly acl--v justable thereabout.

.cured at its outer end, as indicated at 15, 1

17 is a set screw carried by thecollar 15g" and having its inner end arranged to engage the' boss 16 to hold the plate 1'5 and field magnet frame in any desired position of angular adjustment relative to the axis of the shaft 11.

18 is a coil of insulated wire surrounding the polar projection 9, which is the middle polar projection of the three carried by the pole piece 4. 19 is a coil of insulated wire surrounding the polar projection 9, the middle one of the three carried by the pole piece 5. These induction coils may be electrically connected together in any suitable manner. In the drawings, I have shown aconductor 2O connecting them in series.

21 is a binding post carried by one of the arms 15 of the support 15. The free end 18 of the coil of wire 18 is connected with this binding post. The free end 19 of the coil 19 may be connected with one terminal of the ignition system for an internal com bustion motor in any suitable manner. The

free end 18 of the coil 18 may be suitably connected to the other terminal of the said ignition system.

The magnetic fields set up by the two permanent field magnets oppose each other, the direction of the lines of force for each field magnet across the gap between the pole pieces 4, 5, being always the same. When theinductor 12 is in the position shown in Fig. 1, a substantial magnetic short circuit for the permanent magnetsy is established by the inductor across the diametrically opposite wire wound polar projections 9, 9, and the magnetic flux density through the induction coils 18, 19, is at its maximum. As the inductor is rotated in the direction indicated by the arrows in the figures, the magnetic ux density through the induction coils is more or less gradually diminished, in accordance with the speed of rotation of said inductor, until the diametrically opposite armsor projections 12, 12, each of which has been moving closely adjacent -to one of the polar faces on the Wire wound polar projections 9, 9, leave the said polar projections and air gaps are established between the said wire wound polar projections and the inductor; then the magnetic flux density through the said induction coils is suddenly and rapidly diminished, this diminution of magnetic fiux density being emphasized and accelerated by the inductor establishing substantial magnetic short circuits-1 Afor the permanent magnets outside of said induction coils, namely, across thepolar projections 8, 8', on one side of, and across-the polar projections 10, 10', on the other side of said wire Wound polar projections. y

The inductor 12 and the -polar faces on the polar projections carried by the pole pieces 4 and 5 are so shaped and correlated, that the inductor at all times establishes paths substantially equal in magnetic reluctance for both groups of permanent magnets at either side of it,.as shown in Fig. 4.

extensions on the inductor, that at the instant the diametrically opposite pair of extensions on the inductor leave the polar faces of the wire wound polar projections, air gaps are established between all of the polar projections on both pole pieces and the inductor, and that immediately thereaft-er the inductor establishes t-he substantial magnetic short circuits above referred to outside the wire wound polar projections. To accomplish this result, in the device herein shown and described, I have made the Width of the radial projections 12 carried by the inductor less than the distance between the most closely adjacent points at either end of the polar face of each Wire wound polar projection, and the polar face of the polar projection carried by the same pole piece adjacent to it, as shown in Fig. 3.

It will be noted that the polar projections and inductor are so correlated that the results obtained will be the same when the in ductor is turned in either direction, clockwise, or anti-clockwise, so that the apparatus may be readily accommodated to a reversible motor. Furthermore, with this construction, the inductor may be oscillated, if desired, rather than rotated.

In Fig. 5 Ihave illustrated a modified type of inductor over that hereinbefore described, in that the radial extensions on this modified inductor are of sufficient width to close the magnetic circuit across the un- Wound polar projections before they leave the wire wound polar projections and establish air ductor.

What I claim is 1. In an inductor-alternator, the combination of a magnetic field-structure, provided with a pair of oppositely disposed pole-pieces, three polar projections carried gaps between the latter and the inpolar projection of each pole-piece, the two polar projections at either side of the wound projection being unwound, and an inductor substantially inthe shape of a Maltese cross, arranged to move in proximity to said polar projections to vary the distribution of the magnetic flux therethrough.

2. In an inductor-alternator, thecombination of a magnetic field-structure provided with a pair of oppositelv disposed polepieces, three polar projections carried by each pole piece, the polar faces of said projecti'ons being arranged in the arc of la common circle, a winding on the middle polar projection of each pole-piece, the two polar projections at either side of the Wound project-ion being unwound, and an inductor having four arms movabe in proXimity to said polar faces to vary the distribution of the magnetic flux therethrough, the width of said arms at their outer ends being less than the distance between adjacent polar faces.

3. In an inductor-alternator, the combination of a pair of oppositely disposed permanent bar-magnets, pole-pieces for connecting the poles of like polarity, three polar projections carried by each pole-piece, a winding on the middle polar projection of each pole-piece, the two polar projections at either side of the wound projection being unwound, and an inductor substantially in the shape of a Maltese cross arranged to vary the distribution of the magnetic iuX through said polar projections, said inductor in one position establishing a substantial magnetic short-circuit across said wound polar pro-- jections, and in another position establishing a substantial magnetic sho-rt-circuit across said unwound polar projections.

4. In an inductor-alternator, the combination of a magnetic field-structure provided with a pair of oppositely disposed pole pieces, three polar projections carried by each pole piece, a winding on the middle polar projection of each pole-piece, the two polar projections at either side of the wound projection being unwound, a plate of non magnetic material suitably connected to said unwound polar projections for supporting the field-magnet structure, and an'inductor arranged to move in proximity to said polar projections to vary the -distribution ofthe magnetic luX therethrough, said inductor in one position establishing a substantialmagnetic short-circuit across said wound `polar project-ions, and in another position establishing a substantial magnetic shortcircuit across said -unwound polar projections.v p

5. In an inductor-alternator, the combination -of two oppositely disposed groups of permanent bar-magnets, pole-pieces for connecting the poles of like polarity, said polepieces being each recessed at either end to receive the adjacent end ofone of the magnets, and a plurality of U-shaped clips arranged to straddle each one end of a polepiece and the group of magnets in contact therewith, and means for suitably securing said clips to the pole pieces.

6. In an inductor-alternator, the combina- 4tion of a pair ofoppositelydisposedl permanent field-magnets, pole-pieces for connecting the poles oflike polarity, three polar projections carried by one of said polepleces, a--fwlnding on the middlepolar project-ion, the two polar projections at either side of the wound projection being unwound, and an inductorV arrangedto move in proximity to saidpolar projections tovary the distribution 'f the magnetic iux therethroughsaid inductor in one position establishing a substantialmagnetic short-circuit through said winding, and in another position establishing a substantial magnetic short-circuit across said unwound polar projections.

7 In an inductor-alternator, the combination of a magnetic field-structure provided netic short-circuit simultaneously through A both windings, and in another position est-ablishing a substantial magnetic short-circuit simultaneously through all four unwound polar projections.

8. In an inductor-alternator, the combination of a pair of oppositely disposed permanent field-magnets, pole-pieces for connect-, `ing the poles of like polarity, three p olar projections carried by each pole-piece,w1ndings on two of said polar projections, the other of said polar .projections being unwound, and an inductor arranged to move in proximity to said polar projections to vary the distribution of the magnetic iuX therethrough, said inductor in,y one position establishing a substantial magnetic shortcircuit simultaneously through both windin s, and in another position establishing a su stantial magnetic short-circuit simultaneously through all four unwound polar projections. 9. Iny an inductor-alternator, the combination fof a magnetic field-structure pro-` vided with a pair of oppositely disposed pole-pieces, three polar projections carried' by each pole-piece, windings on some of said polar i projections, the other of said polar projections being unwound, and an inductor having four radial arms movable in proximity to said polar projections, saidarms serving in one position to establish a substantial magnetic short-circuit through said wlndings, and in another position tov establish a substantial magnetic short-circuit across said unwound polar projections.

10. In an inductor-alternator,the combination of` a magnetic field-structure provided with a pair of oppositely disposed pole pieces, three polar projections carried' by each pole piece, an inductor having four radial arms movable in proximity tol said polar' projections, said arms serving in one position 'to establish a substantially magnetic short-circuit throughV four of said polar projections, land in another position to establish 'a substantially `magnetic shortcircuit through the two middle/polar projections, and windings so arranged on said polar projections that the magnetic variamanent straight-bar magnets, pole pieces connecting the poles of like polarity, three polar projections'carried by each of said pole pieces, an inductor having four radial arms movable in proximity to said polar projections, said arms serving in one position to establish a substantially magnetic short-circuit through four of said polar projections,r and in another position to establish a substantially magnetic short-circuit through the two middle polar projections, and windings so arranged on said polar projections that the magnetic variations therethrough occur simultaneously as the inductor is rotated.

12. In an inductor alternator, the combination of a pair of oppositely disposed permanent straight-bar magnets, pole pieces arranged between said magnets at right angles thereto for connecting the poles of like polarity and forming With said magnets a substantially rectangular frame, said pole pieces and magnets lying in a single radial plane, three polar projections carried by each of said pole pieces, a Winding on each middle polar projection, the tWo polar projections on each side of the Wound polar projections beingunwound, and an inductor having a plurality of radial arms arranged to move in proximity to said polar projections to vary the magnetic iux therethrough,

said inductor in one position establishingea magnetic short-circuit through said-Wound polar projections and in another position establishing a magnetic short-circuit :through said unWound polar projections.

In testimony whereof I aiiix my signature,

'in presence of two Witnesses.

HENRY J. PoDLEsK. 

